Already, by the 2nd level, I'd say things are too hard. You get penalized for falling, but you get zero points if the timer runs out anyway. The fact that you have go back to the checkpoint should already be enough of a penalty with a timer in place. Additionally, it's not trivial to parse what are safe spots to jump to and what are pits. Especially the gray brick section in the latter half of the 2nd level. The timer feels quite tight even with no falls.